Portion of ductwork



FIG. 1 is a perspective view of a portion of ductwork incorporating the design of our new invention according to a first embodiment;

FIG. 2 is a side view of the portion of ductwork of FIG. 1, the top, bottom and other side views thereof being identical;

FIG. 3 is a front view of the portion of ductwork of FIG. 1;

FIG. 4 is a rear view of the portion of ductwork of FIG. 1;

FIG. 5 is a cross-sectional view taken along line 5—5 of FIG. 4;

FIG. 6 is a perspective view of a portion of ductwork incorporating the design of our invention according to a second embodiment;

FIG. 7 is a side view of the portion of ductwork of FIG. 6, the top, bottom and other side views being identical;

FIG. 8 is a front view of the portion of ductwork of FIG. 6;

FIG. 9 is a rear view of the portion of ductwork of FIG. 6; and,

FIG. 10 is a cross-sectional view taken along line 10—10 of FIG. 9.

The features of the portion of ductwork shown in phantom lines are not elements of the design of our new invention. 

The ornamental design for a portion of ductwork, as shown and described. 